01 -
Bring a large pot of salted water to a boil. Add the dried spaghetti and cook until al dente according to package instructions. Drain and reserve 1/2 cup of the pasta cooking water.
02 -
Heat olive oil in a large skillet over medium-high heat. Add ground beef and season with Cajun seasoning, salt, and black pepper. Sear, breaking up the meat, until well browned and thoroughly cooked. Remove the cooked beef from the skillet and set aside.
03 -
Reduce heat to medium. In the same skillet, melt unsalted butter. Add minced garlic and sauté for about 30 seconds until fragrant.
04 -
Pour heavy cream into the skillet and bring to a gentle simmer. Gradually whisk in shredded mozzarella, shredded sharp cheddar, and grated parmesan, stirring constantly until the sauce is creamy and smooth.
05 -
Add the cooked spaghetti to the cheese sauce in the skillet. Toss well to coat the pasta, adding reserved pasta water as needed to adjust consistency.
06 -
Fold in the seared beef and any accumulated juices. Allow the mixture to simmer together for 1 to 2 minutes for flavors to meld. Plate immediately and garnish with chopped fresh parsley and additional parmesan if desired.